Siemens SIMODRIVE 611 universal, Function Manual

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6
6.8 Angular incremental encoder interface (X461, X462)
6-565
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
These parameters are used to define how many signal periods corres-
pond to the distance to be traveled.
Example:
Assumption:
The dimension system is set to linear, metric
––> 1 MSR = 0.001 mm
The axis should move through 10 mm with 2048 signal periods.
––> P0895 = 2 048
––> P0896 = 10 000 [MSR]
If the angular incremental encoder interface is operated as input, then
the following applies:
––> Switch–in the terminating resistor via switch 1
––> Refer to Chapter 1.3.2
The position reference value, entered via the angular incremental enco-
der interface, is displayed using this parameter.
P0032 ––> Pos. ref. value via the angular incr. enc. interf.
P0020 ––> Position reference value for the pos. controller
It is not absolutely necessary that P0032 and P0020 are the same (e.g.
for an axis coupling).
It is only guaranteed that the input signals are correctly identified and
processed via the angular incremental encoder interface, switched as
input if the following input limiting frequencies and signal limits are
maintained:
Table 6-58 Input limiting frequencies and signal limits
Input limiting frequency Signal limits
Input signal waveform
Position controller clock
cycle (P1009)
1)
1 ms 2 ms 4 ms
Quadrature signal (P0894 = 0) 2.5 MHz 2 MHz 1 MHz Edge clearance
t
a
100 ns
Pulse/direction signal (P0894 = 1) 5 MHz 5 MHz 4 MHz
t
a
100 ns
Pulse width
t
high
, t
low
100 ns
Set–up time
Forwards/backwards signal (P0894 = 2) 5 MHz 5 MHz 4 MHz
high low
Set–up time
t
s
20 ns
1) For clock–synchronous PROFIBUS operation, each time that clock synchronism is established, the
position controller clock is briefly and internally increased in the slave. This means, at this particular instant,
the signal frequency may not exceed half of the permissible input limiting frequency.
Input format
(P0895
and
P0896)
Terminating
resistor
Position reference
value display
(P0032)
Input limiting
frequencies and
signal limits
6 Description of the Functions 01.99
! not 611ue !
08.02